Which statements are true of white blood cells? Check all that apply A. They are called leukocytes
B. They carry carbon dioxide
C. They contain hemoglobin
D. They protect against infection

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele

How does photosynthesis show the conservation of mass and energy?